Technical information

12/01/02
22
ATTENTION !
THIS UNIT HAS A CONTROL PRODUCTS IMPROVED “E” CONTROL
BOARD INSTALLED. HOSHIZAKI PART NUMBER 2A1410-01.
The improved “E” board includes LED lights and audible alarm safeties. The
red LED indicates proper control voltage and will remain on unless a control
voltage problem occurs. At startup a 5 second delay occurs while the board
conducts an internal timer check. A short beep occurs when the power
switch is turned “ON” or “OFF”.
The green LED’s 1~4 represent the corresponding relays and energize and
sequence 5 seconds from initial startup as follows:
Sequence Step LED’s on: Length:Min. Max. Avg.
1 Minute Fill Cycle LED 4 60 sec.
Harvest Cycle LED 1, 4, & 2 2 min. 20 min. 3-5 min.
Freeze Cycle LED 1 5 min. 60 min. 30-35 min.
Reverse Pump Out LED 1, 3, & 2 10 sec. 20 sec. Factory set.
{With light on, LED 1 = Comp/RFM; LED 2 = HGV; LED 3 = PM; LED 4 = WV}
Note: LED’s are not numbered consecutively. They are # 1,4,3,2 from board edge.
The built in safeties shut down the unit and have alarms as follows:
1 beep every 3 sec. = High Evaporator Temperature >127° F.
Check for defrost problem (stuck HGV or relay), hot water entering
unit, stuck headmaster, or shorted thermistor.
2 beeps every 3 sec. = Defrost Back Up Timer. Defrost >20 minutes.
Orange LED marked “H Timer” energizes. Check for open
thermistor, HGV not opening, TXV leaking by, low charge, or
inefficient compressor.
3 beeps every 3 sec. = Freeze Back Up Timer. Freeze > Specified Setting
Yellow LED marked “F Timer” energizes. Check for F/S stuck
closed (up), WV leaking by, HGV leaking by, PM not pumping, TXV
not feeding properly, low charge, or inefficient comp. Dip switches 9
& 10 allow for factory adjustment of this back up timer feature.
Note: 2 & 3 beep alarms represent 2 consecutive occurrences.
Additional alarms for mechanical bin switch:
4 beeps every 3 sec. = Short Circuit between the K4 connection on the
control board and the bin control. Check connections and replace
wire harness if necessary.
5 beeps every 3 sec. = Open Circuit between the K4 connection on the
control board and the bin control. Check connections and replace
wire harness if necessary.
Note: Units with mechanical bin switch installed, dip switch No.7 must be
in the “ON” position. If thermostatic control is used No. 7 must be “OFF”.
To manually reset the above safeties, depress white alarm reset button
with the power supply “ON”.
6 beeps every 3 sec. = Low Voltage. Control voltage < 92 Vac ±5%.
The red LED will de-energize if voltage protection operates.
7 beeps every 3 sec. = High Voltage. Control voltage > 147 Vac ±5%.
The red LED will de-energize if voltage protection operates.
Note: The voltage safety automatically resets when voltage is corrected.
The Output Test switch “S3” provides a relay sequence test. With power
OFF, place S3 on and switch power to ICE. The correct lighting sequence
should be none, 2, 3, 4, 1, & 4, in 5 second intervals, then normal sequence.
Components will cycle during test. S3 should remain in the “OFF” position for
normal operation.
The dip switches should be adjusted per the adjustment chart published in the
Tech Specs book. No. 8 must remain in the “OFF” position.
12/20/03
2/20/03